optimization question
Paul Rubin
phr-n2002b at NOSPAMnightsong.com
Mon Aug 12 17:03:28 CEST 2002
Andrew Koenig <ark at research.att.com> writes:
> If s and t are strings, and I evaluate an expression of the form
>
> s[i:j] == t
>
> can I count on the implementation not to form s[i:j] as a new
> substring? Suppose, for instance, that s is many megabytes
> long, i and j are far apart, and t is very short. Can I assume
> that the execution time for this comparison will be no worse
> than O(len(t)), or must I assume O(j-1)?
I don't understand. If i and j are far apart and t is very short--
in particular, if j-i > len(t) and j < len(s), then s[i:j]==t is
always false.
Do you mean you want to search for t in that range of s? You could
use the regexp module for that.
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